It would help if you also copied the relevant LINK that doesn't work into the thread too, but here:
Code:
https://daskekshaus.de/
This one works fine in browser, and should also work fine in the MOTD window.
Code:
https://www.daskekshaus.de/
This one doesn't work in a browser, and claims that the error code is "SSL_ERROR_BAD_CERT_DOMAIN".
This error is because the hostname (e.g. "www.daskekshaus.de") is not added to the certificate, and therefore the certificate cannot be trusted for that site.
You need to request a certificate holding both "daskekshaus.de" and "www.daskekshaus.de", if you want both "hostnames" to be accessible.
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